Hello RadicalRhinoYT,
Unfortunately, I will be
Rejecting your map.
The theme isn't original, as there are many biomes themed maps already. Please refer to the document in this thread -
https://manacube.com/threads/parkour-list-with-theme.20194/ to make sure your map idea is original.
The build isn't great as it's mainly a few small islands. Try to have one or two main bigger builds that are relevant to your maps theme, then incorporate the parkour into that.
The parkour is a bit repetitive, but you did have a bit of variety in the jumps which is good. I would suggest trying to experiment with a larger variety of blocks and items, to create original and enjoyable jumps.
Most of the parkour is floating, try to avoid having an excessive number of jumps floating over the build and void where possible, as this can make your map look a bit messy.
I did find the parkour confusing, there were a few parts where I can't tell if it was just really confusing, or impossible. Try to have a clear path for your parkour, and try to highlight items such as barriers where possible to make it as easy to follow as possible. I would also recommend testing over your map a few times before submitting to make sure all of your jumps are possible in 1.8.9
The length and difficulty are good for an easy map.
Thanks for submitting your map! I hope to see more maps from you in the future.